Angle that is smaller than a right angle (less than 90Â°). Angle formed by two lines or two perpendicular planes that measures 90Â°. Symbol denoting that a straight line meets another at a right angle. Symbol denoting that two straight lines do not remain at a constant distance from one other. Symbol denoting that two straight lines remain at a constant distance from one another.
Constriction vs. Dilation. Constriction and dilation are opposite, but related, processes in the body. Whereas dilation is an opening or widening of a structure or passageway to increase material flow, constriction leads to a decrease in material flow by closing the passage.
Thinking of one thing, then saying the opposite. lamd. I often say something but am thinking the opposite or something similar. I have no idea that I'm saying the wrong thing until someone points it out. At that moment, I feel kind of a jolt in my head realizing that my brain and speech aren't in sync.